SPIR-V switch statement support

Bug: skia:
Change-Id: I0e44b103820745614c29ff08ab100d46abd3a0de
Reviewed-on: https://skia-review.googlesource.com/70960
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/sksl/SkSLSPIRVCodeGenerator.h b/src/sksl/SkSLSPIRVCodeGenerator.h
index 368e6fb..63d5a40 100644
--- a/src/sksl/SkSLSPIRVCodeGenerator.h
+++ b/src/sksl/SkSLSPIRVCodeGenerator.h
@@ -33,6 +33,7 @@
 #include "ir/SkSLProgramElement.h"
 #include "ir/SkSLReturnStatement.h"
 #include "ir/SkSLStatement.h"
+#include "ir/SkSLSwitchStatement.h"
 #include "ir/SkSLSwizzle.h"
 #include "ir/SkSLTernaryExpression.h"
 #include "ir/SkSLVarDeclarations.h"
@@ -233,6 +234,8 @@
 
     void writeDoStatement(const DoStatement& d, OutputStream& out);
 
+    void writeSwitchStatement(const SwitchStatement& s, OutputStream& out);
+
     void writeReturnStatement(const ReturnStatement& r, OutputStream& out);
 
     void writeCapabilities(OutputStream& out);